The utility model provides an utilization is smelted chute recirculated cooling water waste heat and is prepared device of adopting warm water, including clear hot water soft water pond and the clear circulating cold water soft water pond of circulating, the clear hot water soft water pond intercommunication waste heat hot water circulating pump that circulates, does waste heat hot water circulating pump communicate water water heat exchanger, water the clear circulating cold water soft water pond of water heat exchanger intercommunication, water the hot user of water heat exchanger intercommunication low temperature floor radiating system, the low temperature floor hot user of radiating system feeds through heating circulating pump and heating system moisturizing pump respectively, heating circulating pump intercommunication water water heat exchanger, heating system moisturizing pump and clear circulating cold water soft water pond intercommunication. The utility model discloses can utilize the hot water of smelting chute recirculated cooling water waste heat and producing out low temperature floor radiant heating for building heating such as factories and miness office building, night shift room. On the one hand, reduce winter heating heat source heating load, practice thrift primary energy, the pollution abatement, on the other hand, when reducing the recirculated cooling water temperature, but furthest utilizes the moisturizing volume of surplus heat resource, reduce production.